One of many features disabled in RMVX is the ability to change the Parallaxes, which was available in RMXP (and RM2K/3 before that) directly from the Event Commands. Parallaxes are graphics (usually of clouds or distant landscapes) that can scroll behind a map. While it is possible to set the parallax graphic in the map settings only, this "one parallax per map" rule is rather annoying.
As I start learning RGSS, the scripting language used by RMXP and RMVX, and familiarize myself with its nuances, being able to find workarounds and tweaks is half the fun.
I created a simple but effective (and certainly not perfect) method for changing parallaxes is with a small script in the form of the Change Parallax Scriptlet.